To measure the speed of an approaching car a police officer shines
(A) light waves on it
(B) microwaves on it
(C) radio waves on it
(D) ultra high frequency waves on it
Correct Answer : radio waves on it
Question Asked : SSC Combined Matric Level (Pre) Exam 2002
Explanation : Radar, which stands for Radio Detection and Ranging, is a system that uses reflected radio waves to detect objects and measure their distance and speed. For example, police use radar to calculate the speed of cars.
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Useful Quotations for : UPSC, State PSC, IBPS, SSC, Railway, NDA, Police Exams
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Tags : Physics
